Pitman-rod connection.



BEIQT AVAILABLE COP? No. 786,686. PATENT-ED APR. 4, 1905.

J. L. SCOTT PITMAN ROD CONNECTION.

APPLICATION FILED SEPT. 22, 1904.

seer AVAILABLE cos- Patented April 1, 1905.

PATENT QFFECE.

JAMES LUTHER SCOTT, CF LAIR, KENTUCKY.

PlTMAN-ROD CONNECTION.

SPECIFICATION forming part of Letters Patent N 0. 786,686, dated April 4, 1905.

Application filed September 22, 1904. Serial No. 225,493.

To all whom, it Duty concern:

Be it known that I, JAMES LUTHER Soorr, a citizen of the United States, residing at Lair, in the county of Harrison and State of Kentucky, have invented anew and useful Pitman- Rod Connection, of which the following is a specification.

This invention relates to connections or couplings for pitman-rods.

The object of .the invention is to improve the construction and increase the efiiciency and strength of devices of this character and to preclude the possibility of any of its parts working loose while the pitman is in operation.

With the above and other objects in view, as will appear as the nature of the invention is better understood, the same consists in the novel construction and combination of parts of a pitman-coupling, as will be hereinafter fully described and claimed.

In the accompanying drawings, forming a part of this specification, and in which like characters of reference indicate corresponding parts, there is illustrated one form of embodiment of the invention capable of carrying the same into practical operatiomit being understood that the elements therein exhibited may be varied or changed as to shape, proportion, and exact manner of assemblage without departing from the spirit thereof, and in these drawings- Figure 1 is a view in perspective of one end of the pitman-rod, exhibiting the improved coupling. Fig. 2 is a perspective view exhibiting the parts of the coupling disconnected.-

Fig. 3 is a view in vertical longitudinal section.

In the present invention the head 10 of the pitman is provided on one side with a recess 11, having a mortise 12, and with an arm 13, provided at its extremity with a block 14, arranged in alinement with the head and spaced therefrom. Combined with the head is acap 15, which engages the recess 11 and is provided with a tenon 16 to engage the mortise.

12 and with spaced ears 17 and 18, that straddle the block 14 and are pivoted thereto. by a transverse bolt 19. The ears 17 and 18, to-

gether with aportion of the block 14:, are circular in contour, the distance between the outer faces of the ears being equal to the greatest width of the head, so that when the parts are assembled, as shown in Fig. 1, the opposite sides of the head, arm, and cap will all occupy the same plane.

In order 'to permit the cap to be moved through the arc of a circle sufficient to bring it at right angles to its normal or closed position, the block is cutaway at 21 and 22, Fig. 3, the portion thus removed being equal in thickness to the body portion of the cap. As is usual with such structu rcs, a strap 2& is provided which bears against one side of the head and the outer side of the cap. To relieve the bolt 19 from undue strain, there is a fillerblock 25 provided, which is interposed between the end of the block and the inner face of the strap and is inserted in position before the strap is positioned. This block is of a contour to impart a semicircular finish to the end of the pitman, and by this arrangement when the strap is positioned the pitman has the appearance of one of the ordinary kind.

Formed in one end of the head is an openend slot 26, which is adapted to register with an orifice 27, formed in the cap 15, the orifice being somewhat longer than the slot. The strap is provided with orifices 28 and 29, which are adapted to register with the orifices in the cap and the slot in the head and are somewhat longer th'" the last-named parts.

Supported upon arm 13 between the block and the head is a journal-bearing, preferably formed of two parts 30 and 31, with a half-bearing in each and which serve to support a bushing 32, which is engaged by a crankpin. (Not shown.) The member of the journal-bearing 30 is held in engagement with the bushing by a tiller-block 33 and a wedge-key 36 and gib 37, presently to be described. Each journal-block 33 is provided with laterallyextending flanges to prevent displacement, and the bearing member 31 is formed with a convex outer side 34 to engage the adjacent curved surface of the block 1 1 and ears 1'7 and 18.

As above stated, the orifice 27 in the cap is filler-block 33 is provided with a groove 35, inclined to lead from the orifice 27-to the opposite end of the slot 26 to form an inclined seat for the wedge-key 36, the latter to bear against the notched gib 37, which in turn bears against the end walls of the slot 26 and orifice 27. The orifices 28 and 29, being in register with the orifice 27 and slot 26, also receive the wedge-key and the gib, so that when the key is seated the strap will be forced against the rounded end of the head and the filler-block 25, and thus firmly clamp the cap, journal-bearings, and bushing against any tendency to lost motion.

The wedge-key is provided with ascrew 38, which engages a cavity in the gib 37 after the key and gib are properly positioned and opcrates positively to prevent the key from Working loose from jars and vibrations due to the operation of the pitman.

Itwill be seen from the foregoing description that although the device of this inven- .tion is exceedingly simple of construction it is claimed is 1. In a pitman-coupling, a head provided with a mortise, and with an arm extendingin longitudinal alinement with one side thereof and terminating in a laterally projecting block, a cap pivotally connected with the block and having a tenon to engage the mortise, a

longer than the slot 26 in the .head, and the binding-bolt carried Having thus described the invention, what *BE'TAVAlLABLE ne journal-bearing housed within the head, and means for securing the cap to thehead.

2. In a pitman-coupling, a head provided with a mortise and with a slot," and having a laterally projecting arm terminating in a block, a cap pivotally connected with the block and provided with a tenon to engage the mortise and with an orifice to register with the slot, a journal-bearing housed within the head, a'filler-blockresting against one end of the journal-bearing, a notched gib and a key engaging the orifice in the cap and the slot in the head, and a bolt carried by the key and engaging the gib.

3. In a pitman-coupling, a head having a recess on one side and provided with a mortise, and a transverse open-ended slot, an arm projecting from the head and terminating in a block, a cap having ears to straddle the block, and'pivotally connected therewith, said notched head and key passing through the strap and through the orifice and slot, and a by the key and engaging the gib. 1 4

In testimony that I claim the foregoing as my ownI have hereto aflixed my signature in the presence of two witnesses.

' JAMES LUTHER SCOTT. \Vitnesses:

.DAVID R. REES,

A. T. CARR. 

